Seems like this commit fixes the issue:
commit 5478ad10e7850ce3d8b7056db05ddfa3c9ddad9a
Author: Thomas Zimmermann <[email protected]>
Date: Thu Nov 15 11:42:16 2018 +0100
drm/ast: Remove existing framebuffers before loading driver
If vesafb attaches to the AST device, it configures the framebuffer memory
for uncached access by default. When ast.ko later tries to attach itself to
the device, it wants to use write-combining on the framebuffer memory, but
vesefb's existing configuration for uncached access takes precedence. This
results in reduced performance.
Removing the framebuffer's configuration before loding the AST driver fixes
the problem. Other DRM drivers already contain equivalent code.
Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1112963
Signed-off-by: Thomas Zimmermann <[email protected]>
Cc: <[email protected]>
Tested-by: Y.C. Chen <[email protected]>
Reviewed-by: Jean Delvare <[email protected]>
Tested-by: Jean Delvare <[email protected]>
Signed-off-by: Dave Airlie <[email protected]>
I built a kernel [1] with the commit, please test it.
[1] https://people.canonical.com/~khfeng/lp1808183/
** Bug watch added: bugzilla.opensuse.org/ #1112963
https://bugzilla.opensuse.org/show_bug.cgi?id=1112963
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https://bugs.launchpad.net/bugs/1808183
Title:
ASPEED server console output extremely slow after upgrade to 18.04
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