Re: [Intel-gfx] R31 dithering
Am 30.03.2015 um 13:55 schrieb Ville Syrjälä: On Fri, Mar 27, 2015 at 07:57:52PM +0100, Thomas Richter wrote: Thanks and have a nice weekend, BTW I think this bug is about failure to restore the ivch to proper state after suspend (on X30): https://bugs.freedesktop.org/show_bug.cgi?id=49838 Just in case you're looking for more stuff to do around the ivch ;) Well, no x30 around here unfortunately, though I can possibly check for helpers in a German Thinkpad forum. Maybe somebody with enough Linux-awareness can remote-debug and provide a couple of register listings to re-enable the DVO as required during wake-up. Or provides an x30. (-: I'll check and let you know. Greetings, Thomas ___ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
Re: [Intel-gfx] R31 dithering
On Mon, Mar 30, 2015 at 03:54:29PM +0200, Thomas Richter wrote: Am 30.03.2015 um 13:55 schrieb Ville Syrjälä: On Fri, Mar 27, 2015 at 07:57:52PM +0100, Thomas Richter wrote: Thanks and have a nice weekend, BTW I think this bug is about failure to restore the ivch to proper state after suspend (on X30): https://bugs.freedesktop.org/show_bug.cgi?id=49838 Just in case you're looking for more stuff to do around the ivch ;) Well, no x30 around here unfortunately, though I can possibly check for helpers in a German Thinkpad forum. Maybe somebody with enough Linux-awareness can remote-debug and provide a couple of register listings to re-enable the DVO as required during wake-up. Or provides an x30. (-: I'll check and let you know. I was assuming your R31 or whatever would have the same problems. -- Ville Syrjälä Intel OTC ___ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
Re: [Intel-gfx] R31 dithering
Am 30.03.2015 um 15:59 schrieb Ville Syrjälä: On Mon, Mar 30, 2015 at 03:54:29PM +0200, Thomas Richter wrote: Am 30.03.2015 um 13:55 schrieb Ville Syrjälä: On Fri, Mar 27, 2015 at 07:57:52PM +0100, Thomas Richter wrote: Thanks and have a nice weekend, BTW I think this bug is about failure to restore the ivch to proper state after suspend (on X30): https://bugs.freedesktop.org/show_bug.cgi?id=49838 Just in case you're looking for more stuff to do around the ivch ;) Well, no x30 around here unfortunately, though I can possibly check for helpers in a German Thinkpad forum. Maybe somebody with enough Linux-awareness can remote-debug and provide a couple of register listings to re-enable the DVO as required during wake-up. Or provides an x30. (-: I'll check and let you know. I was assuming your R31 or whatever would have the same problems. No, astonishingly, not. Suspend/resume and hibernate work fine. Well, somewhat... Actually, the R31 only supports S1 (standby) correctly and not S3 (suspend to RAM), even though ACPI (the DSDT) makes you believe that S3 would work. Problem is that the bios does not even enter the kernel anymore once you wake it up from S3 - it's completely dead then and the user mode entry point of the kernel is never reached. So the kernel can hardly do anything about this in first place I personally solved the problem by providing a custom DSDT which just disables S3, and it worked happily ever after... Greetings, Thomas ___ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
Re: [Intel-gfx] R31 dithering
On Fri, Mar 27, 2015 at 07:57:52PM +0100, Thomas Richter wrote: Hi Daniel, hi Ville, thanks for your help. I used now the debug output to research how to enable dithering on the intel VCH. Apparently, it is bit #4 in register VR01 that enables dithering. This is cross-checked by enabling in the dvo_ivch.c file, which greatly improves image quality for 24bpp output. The bit itself is documented as reserved in the intel documentation, though it works quite nicely here. I will now cross-check a little bit which other side effects this bit has if combined with other DVO features (16bpp output, and scaler enabled). As soon as I have more, I'll prepare a small kernel patch for it. Thanks and have a nice weekend, BTW I think this bug is about failure to restore the ivch to proper state after suspend (on X30): https://bugs.freedesktop.org/show_bug.cgi?id=49838 Just in case you're looking for more stuff to do around the ivch ;) -- Ville Syrjälä Intel OTC ___ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
[Intel-gfx] R31 dithering
Hi Daniel, hi Ville, thanks for your help. I used now the debug output to research how to enable dithering on the intel VCH. Apparently, it is bit #4 in register VR01 that enables dithering. This is cross-checked by enabling in the dvo_ivch.c file, which greatly improves image quality for 24bpp output. The bit itself is documented as reserved in the intel documentation, though it works quite nicely here. I will now cross-check a little bit which other side effects this bit has if combined with other DVO features (16bpp output, and scaler enabled). As soon as I have more, I'll prepare a small kernel patch for it. Thanks and have a nice weekend, Thomas ___ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
