Messages in this thread | | | Date | Thu, 14 Jun 2012 15:00:46 +0100 | Subject | Re: [3.4 regression] [bisected] DisplayPort fails to come on | From | Dave Airlie <> |
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On Thu, Jun 14, 2012 at 2:26 PM, Wouter M. Koolen <W.M.Koolen-Wijkstra@cwi.nl> wrote: cc'ing Daniel.
> Hi Igor and Len, > > When I cold boot 3.4 on my laptop the second monitor attached to the > displayport stays blank. It works fine with 3.3.8 and earlier. > > I get two error messages in dmesg: > > kernel: video: probe of LNXVIDEO:00 failed with error -5 > > kernel: [drm:intel_dp_complete_link_train] *ERROR* failed to train DP, > aborting > > When I warm boot 3.4 after running kernel 3.3.8 first, only the first > message appears and the display works fine. > > A bisection based on the occurrence of the first error message resulted in > > Author: Igor Murzov <intergalactic.anonymous@gmail.com> 2012-03-30 18:32:08 > Committer: Len Brown <len.brown@intel.com> 2012-03-30 20:44:05 > Parent: c16fa4f2ad19908a47c63d8fa436a1178438c7e7 (Linux 3.3) > Branches: linux-3.4.y, remotes/origin/linux-3.4.y, remotes/origin/master > Follows: v3.3 > Precedes: v3.4-rc1 > > ACPI video: Harden video bus adding. > > It is always better to check return values, so add some new checks and > correct existing ones. > > v2: Be consistent and don't mix errors from -E* and AE_* namespaces. > > Signed-off-by: Igor Murzov <e-mail@date.by> > Signed-off-by: Len Brown <len.brown@intel.com> > > > The laptop is a Dell System XPS L702X/0XN71K, BIOS A17 02/22/2012. It has > two graphics card in Optimus configuration: > 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core > Processor Family Integrated Graphics Controller (rev 09) > 01:00.0 VGA compatible controller: NVIDIA Corporation Device 124d (rev a1) > > I only use the Intel card (which drives the DP port if I am not mistaken) > > I hope this is helpful. Please let me know what I can do next to track this > problem down. > > With kind regards, > > Wouter Koolen -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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