[Bug 42729] New: Monitor EDID handling causes system freezes every few seconds.

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=42729

           Summary: Monitor EDID handling causes system freezes every few
                    seconds.
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.2.1-3.2.2
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri@kernel-bugs.osdl.org
        ReportedBy: subscription.discussion@gmail.com
        Regression: No


Created an attachment (id=72281)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=72281)
dmesg

Whenever my Compaq S9500 monitor is connected, the kernel outputs errors about
invalid EDID checksum. The system also freezes for a couple of seconds every
5-10 seconds or so, possibly around the same time the errors are reported to
the terminal. The problem can be circumvented by adding nomodeset to the kernel
line, or disconnecting the monitor. However, using nomodeset seems to disable
accelerated graphics, so neither of the fixes are very usable.

The first time the problem occurred was when my Nvidia GPU (with proprietary
drivers) broke and I had to switch to my old ATI Radeon GPU (with the
open-source radeon driver). I have tried using two monitors and using only a
single monitor, but the problem goes away only if the "broken" monitor is
disconnected.

I think the driver should just ignore the parts of the EDID that are invalid,
instead of repeatedly doing something that makes the system unresponsive.

I'm using a x86_64 Arch Linux, kernel 3.2.2-1-ARCH.
GPU: Radeon X8xx (X800XL if I recall correctly, but lspci reports it as an "ATI
Technologies Inc Radeon R423 UK [Radeon X800SE (PCIE)]. The X800XL, however, is
R430 according to Wikipedia.)

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