Re: S-Video on ThinkPad T42 with Debian Jessie - can't get above 800x600
On Sun, Apr 13, 2014 at 1:39 AM, Chris Angelico ros...@gmail.com wrote: On Fri, Apr 11, 2014 at 12:50 AM, Chris Angelico ros...@gmail.com wrote: I've just converted a laptop from Windows XP to Debian Jessie, with the expectation that I'd be able to do everything at least as well as before. That's been mostly true, but I'm stuck on a problem with the S-Video output: whatever I do, the TV shows only 800x600. In the interests of experimentation, I live-booted AntiX on that same hardware. The result is exactly the same; xrandr says the S-video output is in its only mode of 800x600 60Hz, and telling it to go 1024x768 just results in the top left 800x600 being visible. Further experimentation has revealed a rather interesting result. It seems that Windows was claiming that it was driving the S-video at 1024x768, but was actually stretching it down to 800x600. Short of reinstalling Windows (which I will not do!), I have no way to prove this, but anecdotal evidence is that text is a bit more readable now. So it's looking like 800x600 is all we really get anyway. Everything's working other than that, so I'm basically going to consider the matter closed, unless anyone has fancy ideas to try. ChrisA -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/CAPTjJmpNKaDY6t4ZOpuA0httvsSr=hhni0cfvosaqlzn17r...@mail.gmail.com
Re: S-Video on ThinkPad T42 with Debian Jessie - can't get above 800x600
On Sun, 13 Apr 2014 20:57:46 +1000 Chris Angelico ros...@gmail.com wrote: On Sun, Apr 13, 2014 at 1:39 AM, Chris Angelico ros...@gmail.com wrote: On Fri, Apr 11, 2014 at 12:50 AM, Chris Angelico ros...@gmail.com wrote: I've just converted a laptop from Windows XP to Debian Jessie, with the expectation that I'd be able to do everything at least as well as before. That's been mostly true, but I'm stuck on a problem with the S-Video output: whatever I do, the TV shows only 800x600. In the interests of experimentation, I live-booted AntiX on that same hardware. The result is exactly the same; xrandr says the S-video output is in its only mode of 800x600 60Hz, and telling it to go 1024x768 just results in the top left 800x600 being visible. Further experimentation has revealed a rather interesting result. It seems that Windows was claiming that it was driving the S-video at 1024x768, but was actually stretching it down to 800x600. Short of reinstalling Windows (which I will not do!), I have no way to prove this, but anecdotal evidence is that text is a bit more readable now. So it's looking like 800x600 is all we really get anyway. Everything's working other than that, so I'm basically going to consider the matter closed, unless anyone has fancy ideas to try. I was waiting for someone more knowledgeable to answer, as I've never used S-Video with computers, but downconversion does seem likely. I did wonder what was going on, because as far as I knew S-Video is defined only for PAL and NTSC, 576i/50 and 480i/60 in modern terminology. The point of it is that analogue luminance and chrominance are carried on separate channels, thus avoiding some of the nastiness inherent in encoding colour into a luminance signal. It really is a TV signal, and an analogue standard definition one at that. It would seem that the Linux driver doesn't control the video card downconversion process properly, but as you say, a downconversion from 1024x768 isn't going to give you better results than from 800x600. Mr Google says that JVC first used S-Video in 1987, but it would have been around 1981 that I modified a Hitachi SK-81 camera to provide separate Y and C outputs to feed a portable U-Matic, modified by Roderick Snell who was then working at Brighton Polytechnic. -- Joe -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/20140413162729.34ff9...@jretrading.com
Re: S-Video on ThinkPad T42 with Debian Jessie - can't get above 800x600
On Mon, Apr 14, 2014 at 1:27 AM, Joe j...@jretrading.com wrote: I did wonder what was going on, because as far as I knew S-Video is defined only for PAL and NTSC, 576i/50 and 480i/60 in modern terminology. The point of it is that analogue luminance and chrominance are carried on separate channels, thus avoiding some of the nastiness inherent in encoding colour into a luminance signal. It really is a TV signal, and an analogue standard definition one at that. Interesting. My brother has a desktop video card (an Nvidia one, but I didn't ask what exact card it is) with S-Video output, and he plugged it into the same TV via the same cable as the laptop had been using. According to xrandr, resolutions went up to (I think) 1024x768, but he saw some oddities, which could have been caused by a stretching down. I never thought to check the definition of S-Video, as I thought (naively) that Windows was being honest when it told me it was running it at 1024x768. Thanks for the response. The silence was a little worrying - I was afraid nobody here had ever used S-Video with old hardware, and that I'd be completely on my own. ChrisA -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/captjjmpq_mq9fokbghxsopuuoa3h1zxt7sbjuk5_w59qbb6...@mail.gmail.com
Re: S-Video on ThinkPad T42 with Debian Jessie - can't get above 800x600
On Fri, Apr 11, 2014 at 12:50 AM, Chris Angelico ros...@gmail.com wrote: I've just converted a laptop from Windows XP to Debian Jessie, with the expectation that I'd be able to do everything at least as well as before. That's been mostly true, but I'm stuck on a problem with the S-Video output: whatever I do, the TV shows only 800x600. In the interests of experimentation, I live-booted AntiX on that same hardware. The result is exactly the same; xrandr says the S-video output is in its only mode of 800x600 60Hz, and telling it to go 1024x768 just results in the top left 800x600 being visible. Any ideas? ChrisA -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/captjjmqlb6nmlk1ekpcdguk5gbwz9vz9r4cqvyf4ysrc+yb...@mail.gmail.com
S-Video on ThinkPad T42 with Debian Jessie - can't get above 800x600
Hi! I've just converted a laptop from Windows XP to Debian Jessie, with the expectation that I'd be able to do everything at least as well as before. That's been mostly true, but I'm stuck on a problem with the S-Video output: whatever I do, the TV shows only 800x600. I can force the S-Video output to a higher resolution thus: rosuav@yosemite:~$ cvt 1024 768 60 # 1024x768 59.92 Hz (CVT 0.79M3) hsync: 47.82 kHz; pclk: 63.50 MHz Modeline 1024x768_60.00 63.50 1024 1072 1176 1328 768 771 775 798 -hsync +vsync rosuav@yosemite:~$ xrandr --newmode 1024x768_60.00 63.50 1024 1072 1176 1328 768 771 775 798 -hsync +vsync rosuav@yosemite:~$ xrandr --addmode S-video 1024x768_60.00 rosuav@yosemite:~$ xrandr --output S-video --mode 1024x768_60.00 but the TV shows only the top-left 800x600 of the desktop (which is happily running in 1024x768 for the internal LCD). Google brought me to threads like https://lists.debian.org/debian-user/2011/08/msg00050.html and Wiki pages like http://www.thinkwiki.org/wiki/ATI_Mobility_Radeon_7500 which were of some help, but they got me as far as the above problem :) Relevant sections of various command outputs: rosuav@yosemite:~$ lspci -vvnn 01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] RV200/M7 [Mobility Radeon 7500] [1002:4c57] (prog-if 00 [VGA controller]) Subsystem: IBM ThinkPad T42 2373-4WU [1014:0530] Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping+ SERR+ FastB2B+ DisINTx- Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium TAbort- TAbort- MAbort- SERR- PERR- INTx- Latency: 66 (2000ns min), Cache Line Size: 32 bytes Interrupt: pin A routed to IRQ 11 Region 0: Memory at e000 (32-bit, prefetchable) [size=128M] Region 1: I/O ports at 3000 [size=256] Region 2: Memory at c010 (32-bit, non-prefetchable) [size=64K] [virtual] Expansion ROM at c012 [disabled] [size=128K] Capabilities: [58] AGP version 2.0 Status: RQ=48 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x1,x2,x4 Command: RQ=32 ArqSz=0 Cal=0 SBA+ AGP+ GART64- 64bit- FW- Rate=x1 Capabilities: [50] Power Management version 2 Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME- Kernel driver in use: radeon rosuav@yosemite:~$ xrandr --verbose S-video connected 800x600+0+0 (0x57) normal (normal left inverted right x axis y axis) 0mm x 0mm Identifier: 0x54 Timestamp: 30502 Subpixel: no subpixels Gamma: 1.0:1.0:1.0 Brightness: 1.0 Clones: CRTC: 1 CRTCs: 0 1 Transform: 1.00 0.00 0.00 0.00 1.00 0.00 0.00 0.00 1.00 filter: tv standard: ntsc supported: ntsc, pal, pal-m, pal-60, ntsc-j, scart-pal, pal-cn, secam load detection: 1 range: (0, 1) 800x600 (0x57) 38.2MHz -HSync +VSync *current +preferred h: width 800 start 832 end 912 total 1024 skew0 clock 37.4KHz v: height 600 start 603 end 607 total 624 clock 59.9Hz I'm not using any xorg.conf at the moment. Does it make any difference that, for reasons of practicality, I do most of the configuration over ssh? I start with export DISPLAY=:0.0 and the commands appear to have the right effect, but if that could potentially cause problems, I do have physical console access (it's just in a different room and in an awkward position). The TV is connected via S-Video cable; it was previously using S-Video to coax of some sort, so I switched out the cable and the TV's input port, but nothing changed. Debian Jessie has been working well for us on two other computers in the house, and Wheezy and Squeeze for most of the rest. If I need to downgrade to Wheezy to solve this, I can do that. All help gratefully received! Chris Angelico -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/captjjmpcwx2fz75edkv_gwqr6uocmqagscqdxzfubhtmdxc...@mail.gmail.com
