DVI output > monitor blinking at max res. in X session (VGA - OK, text mode OK)

Eduard Tibet eduard.tibet at gmail.com
Sun Feb 17 03:56:50 PST 2013


Sorry for some delay..

Here are test results: kernel changed from > 3.7.4

1. loading without any radeon specific kernel options > the same
result (totally unusable, 1 flickering in 2 sec.)
2. loading with radeon.disp_priority=2 > the same result (totally
unusable, 1 flickering in 2 sec.)
3. loading with radeon.new_pll=0 > the same result (totally unusable,
1 flickering in 2 sec.)
4. loading with radeon.disp_priority=2 AND radeon.new_pll=0 > much
better (partially usable, 1 flickering in 15-20 sec., but, of course
in general can't be used).

Resolution used:; 1600 x1200

At resolution 1280x1024 (non-default, lower)  - still all OK with any
options above.

Is it Radeon 9200 card related stuff or not?

Thank you!

2013/2/4 Alex Deucher <alexdeucher at gmail.com>:
> On Sun, Feb 3, 2013 at 7:54 AM, Eduard Tibet <eduard.tibet at gmail.com> wrote:
>> Hello!
>> I've already post this message to other several X-related forums some
>> time ago, but unfortunately I didn't get some information from there.
>> Seems that other people didn't faced such problems. Searching this
>> list for such problem gives some results but don't seem to be the same
>> as mine.
>> Initial state:
>> I have 1 graphic card (based on ATI Radeon 9200) and 2 monitors (both
>> EIZO) with Debian 6.0 powered PC (default kernel
>> Monitors have different resolutions: S1961 (1280x1024) and L985EX
>> (1600x1200). I use only single monitor each time (the other one even
>> doesn't connected to signal output). Both are works OK in console
>> (text) modes at all outputs (so technically they are seems to be OK).
>> S1961 works OK in all modes at all outputs in X session (DVI, VGA).
>> But L985EX has very strange problem: it works OK in all modes at VGA
>> output, but begins to blink when using DVI output. It seems like
>> monitor probing procedure takes place (i.e.: blank screen 1-2 sec. >
>> restoring image 2-3 sec. > blank screen again 1-2 sec. > restoring
>> image 2-3 sec.). Other interesting thing that the frequency of such
>> behaviour is mostly depends on resolution. At default (max res.)
>> 1600x1200 there are no possible to do anything in X session (blanking
>> and stable image are approx. 2 sec. each). If I change the resolution
>> to 1280x1024 X session begin more stable (blanking for 1 sec with
>> 20-30 sec. interval of stable image). If I change the resolution
>> futher to 1024x768 X session begin most stable at DVI output. I don't
>> face any blinking at all.
> Sounds like display bandwidth issues.  You might try setting the
> display priority to high:
> radeon.disp_priority=2
> As per your attempt 4 below.  As for the error you are getting, your
> kernel may be too old to support that parameter.  A newer kernel may
> work better in general.
> Alex
>> My experiments to solve the issue:
>> Try 1. First I tried to use other hdd with other non X-based OS and it
>> seems to be OK at 1600x1200 at DVI so it seems not to be a real
>> hardware problem.
>> Try 2. Then I tried to upgrade X.org to most recent version from
>> debian backports repo (first - was, second - upgraded): xserver-xorg
>> (7.5.8 > 7.6.8), xserver-xorg-core ( >
>> xserver-xorg-video-radeon ( > Sorry for the
>> packages name - they are debian specific, because I don't know how it
>> called in X repo. But nothing happened.
>> Try 3. I tried to play with xrandr modes, but no success.
>> Try 4. I tried to put radeon.disp_priority=2 at kernel boot (as
>> mentioned at [1], [2], [3]) but got an error message: "[5.433004]
>> radeon: Unknown parameter `disp_priority'" (initial call string:
>> [0.000000] Kernel command line: BOOT_IMAGE=/vmlinuz-2.6.32-5-686
>> root=UUID=4ddfc6de-7006-47ae-b142-7fdf1228beae ro quiet
>> radeon.disp_priority=2 )
>> Now I don't know where to digg to solve the issue.
>> I know that I need to provide the X.org.log and dmesg.out, but I don't
>> know, if I allowed to send it directly to the list.
>> [1] https://bugzilla.kernel.org/show_bug.cgi?id=26552
>> [2] https://bugs.freedesktop.org/show_bug.cgi?id=33657
>> [3] https://bugs.freedesktop.org/show_bug.cgi?id=48772
>> --
>> regards, Eduard
>> _______________________________________________
>> xorg at lists.x.org: X.Org support
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