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Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1891790
Title:
lubuntu 18.04.5 text unreadable on old thinkpads (radeon, HWE 5.4
kernel only)
Status in linux package in Ubuntu:
Incomplete
Bug description:
** Summary
Screen is unreadable much of the time with black badly-tuned-digital-tv type
fragments covering image. As you action things (use a menu, click on a
different window etc) the black fragments move (though often only parts of
screen; not all of screen)
** Background
This was looked into because of a number of support requests and I
detected a pattern. All users are using the HWE kernel, and issue
didn't occur using 18.04.4, though I personally only tested the live
daily (during the development cycle).
- thinkpad x31
https://discourse.lubuntu.me/t/reviving-thinkpad-x31-problems-with-messed-up-screen/1457/
- thinkpad t42
https://ubuntuforums.org/showthread.php?t=2448800&p=13979514#post13979514
- thinkpad t41
https://askubuntu.com/questions/1266918/latest-updates-to-lubuntu-18-04-4-lts-32-bit-create-almost-impossible-graphics-i
(and I believe others before I recognized the pattern & started
noting; I ignored initially as I had no issues with t43, not having
used the t42p or r50p in QA testing for awhile - a scan of my QA-
testing live will show when I tested with each box in first line of
comments). I've also seen this on very different boxes to old
thinkpads too.
My boxes impacted
- ibm thinkpad t42p (pentium m, 2gb ram, amd/ati mobility firegl t2;
rv350/m10 gl)
- ibm thinkpad r50p (pentium m, 1gb ram, amd/ati mobility firegl t2;
rv350/m10 gl)
** 20.04/HWE kernel only
If I live QA-test using the 18.04.4 ISO or released image, no issues
occur (using 5.3 kernel & it's packages). Likewise I have no issues
using the GA (4.15) kernel in testing (the r50p was used more
regularly in testing in prior bionic cycles, alas not much in 18.04.5
development/recently; expecting same results with thinkpad t43 which
does not have this issue)
This report should possibly be filed on xserver-xorg. I've only
experienced it with old radeon thinkpads (but screen on box makes it
difficult to explore)
(Filed online as I've been struggling to file this on actual box)
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