[Bug 97578] New: Radeon HD 5450 suddenly blanks screen or shows old content

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Fri Sep 2 17:30:44 UTC 2016


            Bug ID: 97578
           Summary: Radeon HD 5450 suddenly blanks screen or shows old
           Product: xorg
           Version: 7.7 (2012.06)
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: markus.naeher at gmx.net
        QA Contact: xorg-team at lists.x.org

Some Background info:

I'm using the radeon driver for my Radeon HD 5450 on ArchLinux (x86_64) with
XFCE desktop.

The issue occurs since one of the latest software updates, on two PC's with a
Radon HD 5450, both with two screens attached. Because of the two PC's, I think
a hardware defect is unlikely. On one of the PC's, I've tried a Radeon HD 7750
(borroewd from a friend), and the issue was gone until I had to give it back. I
did not change any settings during the test.

This is what happens:

Sometimes, it "forgets" what it should display on the screen and suddenly, I
see a mix of an old screen content, with some black areas and (most times, but
not always) a part of the xscreensaver dialog. The issue can be triggered by
opening a window, menu, or dialog or even some animation within a window. One
thing that often "works" as a trigger is the "blue arrow" animation of firefox
when I start a download. Sometimes it can just be the blinking of the cursor in
a text editor like geany. But the trigger is not always that obvious.

When I try to force a redraw of the whole screen by switching between virtual
desktops or between console and X, it shows the correct screen content for a
split second, and then switches to the wrong display again. It looks like
flickering between two states.

The only way (other than rebooting) I found out to stop it is to identify the
trigger window and close (or hide) it. Sometimes I can restore it without
triggering again, sometimes not. Sometimes it stops after a few minutes,
sometimes not. Until it stops, the PC is completely unusable. But even
identifying the right window and trying to hit the minimize or close button
with the mouse when you can't see what you're doing is really hard.

As of the PC's has long-running jobs that can not be suspended and resumed,
rebooting is mostly not an option.

I'm not 100% sure, but I think it happens after the lockscreen once was
activated, either manually or by idle timer. From reboot to first lockscreen, I
think I haven't experienced it yet. Other than lockscreen, I don't use any

The screen content that is displays can be really old: Yesterday, I changed my
desktop background, and today, I saw the old background when it happened (no
reboot in between).

I really would like to keep my 5450's, because they are really good office
cards (passive cooling, dual DVI-I, ...) and even good enough for some gaming.
But the issue literally drives me crazy.

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