lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Mon, 7 Jun 2010 02:32:48 -0400 From: Alex Deucher <alexdeucher@...il.com> To: Dave Airlie <airlied@...il.com> Cc: Torsten Kaiser <just.for.lkml@...glemail.com>, Linus Torvalds <torvalds@...ux-foundation.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: Linux 2.6.35-rc2 On Mon, Jun 7, 2010 at 2:22 AM, Dave Airlie <airlied@...il.com> wrote: > On Mon, Jun 7, 2010 at 4:09 PM, Torsten Kaiser > <just.for.lkml@...glemail.com> wrote: >> On Mon, Jun 7, 2010 at 7:58 AM, Alex Deucher <alexdeucher@...il.com> wrote: >>> On Sun, Jun 6, 2010 at 11:04 AM, Torsten Kaiser >>> <just.for.lkml@...glemail.com> wrote: >>>> [CC:Jeff+Tejun not removed, because you might want to look at the >>>> attached dmesgs] >>>> >>>> On Sun, Jun 6, 2010 at 4:19 PM, Linus Torvalds >>>> <torvalds@...ux-foundation.org> wrote: >>>>> On Sun, 6 Jun 2010, Torsten Kaiser wrote: >>>>>> >>>>>> The first problem that shows up is, that after the KMS switches to the >>>>>> correct video mode (1280x1024 for an DVI attached LCD), the display >>>>>> begins to flicker. Every 1..2 seconds (guesstimated) the display turns >>>>>> off and on again. Something in the new powersaving? >>>>> >>>>> Or maybe a borderline display timing that the display has trouble syncing >>>>> up with? >>>> >>>> With 2.6.34 and any previous KMS kernels the output was always stable. >>>> (I think, I switch to the radeon KMS on 2.6.32) >>>> The onscreen menu of the monitor showed 1280x1024@...2Hz for >>>> 2.6.35-rc2, if I recall correctly. >>>> Now back on 2.6.34 its 1280x1024@...9Hz. >>> >>> The pm code shouldn't have any affect as your system only has one >>> power state, so it never kicks in. It sounds like a display pll >>> problem, but there haven't been any changes to that code since 2.6.34. >>> Any chance you could bisect it? >> >> Not really. -rc1 did not boot for me (although if I disable v4l that >> might work), and there is this memory corruption error. >> >> Regarding the PLLs, did you see this mail? It contains the >> drm.debug=15 output from 2.6.34 and 2.6.35-rc2. >> http://lkml.org/lkml/2010/6/6/126 >> >> The debug output from radeon_set_pll looks identical. But in 2.6.35 a >> call to [drm:radeon_legacy_tmds_int_dpms], seems new. >> >> The switchoff intervall is ~10 seconds, not 1..2 as I guessed in the first mail. >> Any idea if there is something in the KMS code that triggers at this intervall? > > The new mode probing code happens every 10 seconds, though we > shouldn't be turning anything on or off with it. > > So I suspect the DAC detection table might be doing bad things on your > hardware, we have had a problem where the dac detect table on one DAC > would turn the other one off which clearly wasn't what we wanted to > see. > , The x300 is a non-atom card, so it uses the legacy load detection routines which do mess with some of the crtc regs. Alex > can you file a bug at kernel.org? full dmesg (need all the radeon bits > where it finds the card). > > Dave. > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists