On December 1, 2022 9:41 PM, I wrote:
>> Out of the blue today, my usual screen resolution (1920x1200) became
>> unavailable. ...
On December 4, 2022 1:26 AM, Felix Miata <mrma...@earthlink.net> replied:
> Your old Xorg.0.logs differ significantly from your current ones ...
> This suggests to me your EDID is currently being misread or is incomplete.
> Does your VGA cable have 15 pins on both ends, or only 14? ...
It has 14 pins. This monitor and cable have worked fine since 2014 with this
desktop running Debian. About a week before the problem started, I did
disconnect the VGA cable from the desktop input. I just reseated it
carefully and even rebooted, but that didn't fix the problem. Maybe I fried
something messing with the connection.
I can confirm that my /var/log/Xorg.0.log (Jul 3 2021) has the EDID content
while ~/.local/share/xorg/Xorg.0.log (Dec 4 11:57) does not.
> Something to try: switch display driver from modesetting to intel. If
> xserver-xorg-video-intel is not installed, it should be used automatically if
> you install it. If it's already installed, then likely there's a .conf file
> in /etc/X11/xorg.conf.d/ specifically calling it that you could switch to
> calling intel instead.
I do have /usr/lib/xserver-xorg-video-intel. I don't have
/etc/X11/xorg.conf.d/ but do have /usr/share/X11/xorg.conf.d/ with the
following:
10-amdgpu.conf 10-quirks.conf 10-radeon.conf 40-libinput.conf
70-wacom.conf
It wasn't obvious to me that these were relevant.
I don't have any useful spare hardware at home, although I do at work. I
could steal a VGA cable to test here.
Thanks again.
________________________________________
From: Felix Miata <mrma...@earthlink.net>
Sent: Sunday, December 4, 2022 1:26 AM
To: debian-user@lists.debian.org
Subject: Re: loss of screen resolution
External Email: Use Caution
Kleene, Steven (kleenesj) composed on 2022-12-02 02:41 (UTC):
...
Your old Xorg.0.logs differ significantly from your current ones, and my
own on a similar Intel GPU. In what follows, the current ones and the old
ones omit everything between the first and last lines:
*****
[ 2059.607] (II) modeset(0): EDID for output VGA-1
[ 2059.607] (II) modeset(0): Manufacturer: DEL Model: a079 Serial#: 810693964
[ 2059.607] (II) modeset(0): Year: 2014 Week: 24
[ 2059.607] (II) modeset(0): EDID Version: 1.3
[ 2059.607] (II) modeset(0): Analog Display Input, Input Voltage Level:
0.700/0.300 V
[ 2059.607] (II) modeset(0): Sync: Separate Composite SyncOnGreen
[ 2059.607] (II) modeset(0): Max Image Size [cm]: horiz.: 52 vert.: 32
[ 2059.607] (II) modeset(0): Gamma: 2.20
[ 2059.607] (II) modeset(0): DPMS capabilities: StandBy Suspend Off; RGB/Color
Display
[ 2059.607] (II) modeset(0): First detailed timing is preferred mode
[ 2059.607] (II) modeset(0): redX: 0.640 redY: 0.330 greenX: 0.300 greenY:
0.600
[ 2059.607] (II) modeset(0): blueX: 0.150 blueY: 0.060 whiteX: 0.313 whiteY:
0.329
[ 2059.607] (II) modeset(0): Supported established timings:
[ 2059.607] (II) modeset(0): 720x400@70Hz
[ 2059.607] (II) modeset(0): 640x480@60Hz
[ 2059.607] (II) modeset(0): 800x600@60Hz
[ 2059.607] (II) modeset(0): 1024x768@60Hz
[ 2059.607] (II) modeset(0): Manufacturer's mask: 0
[ 2059.607] (II) modeset(0): Supported standard timings:
[ 2059.607] (II) modeset(0): #0: hsize: 1280 vsize 960 refresh: 60 vid:
16513
[ 2059.607] (II) modeset(0): #1: hsize: 1280 vsize 1024 refresh: 60 vid:
32897
[ 2059.607] (II) modeset(0): #2: hsize: 1600 vsize 1200 refresh: 60 vid:
16553
[ 2059.607] (II) modeset(0): #3: hsize: 1680 vsize 1050 refresh: 60 vid: 179
[ 2059.607] (II) modeset(0): #4: hsize: 1920 vsize 1080 refresh: 60 vid:
49361
[ 2059.607] (II) modeset(0): Supported detailed timing:
[ 2059.607] (II) modeset(0): clock: 154.0 MHz Image Size: 518 x 324 mm
[ 2059.607] (II) modeset(0): h_active: 1920 h_sync: 1968 h_sync_end 2000
h_blank_end 2080 h_border: 0
[ 2059.607] (II) modeset(0): v_active: 1200 v_sync: 1203 v_sync_end 1209
v_blanking: 1235 v_border: 0
[ 2059.607] (II) modeset(0): Serial No: YMYH146D0R5L
[ 2059.607] (II) modeset(0): Monitor name: DELL U2412M
[ 2059.608] (II) modeset(0): Ranges: V min: 50 V max: 61 Hz, H min: 30 H max:
83 kHz, PixClock max 175 MHz
[ 2059.608] (II) modeset(0): EDID (in hex):
[ 2059.608] (II) modeset(0): 00ffffffffffff0010ac79a04c355230
[ 2059.608] (II) modeset(0): 181801030e342078eaee95a3544c9926
[ 2059.608] (II) modeset(0): 0f5054a1080081408180a940b300d1c0
[ 2059.608] (II) modeset(0): 010101010101283c80a070b023403020
[ 2059.608] (II) modeset(0): 360006442100001a000000ff00594d59
[ 2059.608] (II) modeset(0): 48313436443052354c0a000000fc0044
[ 2059.608] (II) modeset(0): 454c4c2055323431324d0a20000000fd
[ 2059.608] (II) modeset(0): 00323d1e5311000a2020202020200092
[ 2059.608] (II) modeset(0): Printing probed modes for output VGA-1
*****
This suggests to me your EDID is currently being misread or is incomplete.
Does your VGA cable have 15 pins on both ends, or only 14? Do you have
another VGA cable you could try? Do you have any other PCs with VGA output
available that you could test with your display? Do you have a FullHD TV
with VGA input you could test 1920x1080 with? Perhaps your cable simply
could use a removal and refitting.
Something to try: switch display driver from modesetting to intel. If
xserver-xorg-video-intel is not installed, it should be used automatically
if you install it. If it's already installed, then likely there's a .conf
file in /etc/X11/xorg.conf.d/ specifically calling it that you could switch
to calling intel instead.
The modesetting display driver is newer technology developed in large part
by Intel's driver programmers, and is responsible for the intel display
driver not having an official release in nearly a decade. Sometimes it works
better, or at least works when the modesetting driver has a bug, but the
modesetting is actually the default for AMD, Intel, NVidia and all other GPUs
for which a KMS module exists.
--
Evolution as taught in public schools is, like religion,
based on faith, not based on science.
Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!
Felix Miata
