Public bug reported:
[Impact]
* Ubuntu 18.04 used as a guest in KVM with Spice/QXL in use may lead to a DRM
error displayed during xorg launch:
[drm:qxl_enc_commit [qxl]] *ERROR* head number too large or missing monitors
config: (ptrval), 0
[Fix]
* 00e5d217fa19bcbec13135898e1b9ca2c1c3e89b qxl: hook monitors_config
updates into crtc, not encoder.
[Test Case]
* Ubuntu 18.04 desktop guest with 4.15-series kernel with Spice/QXL.
* I used Ubuntu 20.04 as the host, but I was reported that the issue is similar
also on Centos 7.8 used as a host.
[Regression Potential]
* Fix is limited to the QXL driver, so any regressions will be related
to graphics (either potential drm errors or graphical artifacts).
[Other]
* This has been fixed in HWE kernels and in later Ubuntu releases. Only Bionic
is affected.
* According to the description in drivers/gpu/drm/qxl/qxl_dev.h:
struct qxl_monitors_config {
(...)
uint16_t max_allowed; /* If it is 0 no fixed limit is given by the
driver */
(...)
};
In the message this value is 0 which should be a completely correct situation
in that context. However, it is incorrectly compared against current qxl_output.
This has been fixed soon after Bionic release and in Bionic is marked with:
/* TODO: ugly, do better */
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Fix Released
** Affects: linux (Ubuntu Bionic)
Importance: Medium
Status: New
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Status: New => Fix Released
** Changed in: linux (Ubuntu Bionic)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/1908219
Title:
[drm:qxl_enc_commit [qxl]] *ERROR* head number too large or missing
monitors config:
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