Bug 191591 - [vt] vt_vga driver produces corrupted output with fonts other than 8 pixels wide
Summary: [vt] vt_vga driver produces corrupted output with fonts other than 8 pixels wide
Status: Closed FIXED
Alias: None
Product: Base System
Classification: Unclassified
Component: kern (show other bugs)
Version: CURRENT
Hardware: Any Any
: --- Affects Some People
Assignee: Jean-Sébastien Pédron
URL:
Keywords: vt
Depends on:
Blocks:
 
Reported: 2014-07-03 21:35 UTC by Ed Maste
Modified: 2014-08-23 02:37 UTC (History)
1 user (show)

See Also:

Attachments
QEMU screenshot of vt_vga with gallant font loaded (12.21 KB, image/png)
2014-07-03 21:36 UTC, Ed Maste 		no flags Details
View All Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description Ed Maste freebsd_committer freebsd_triage 2014-07-03 21:35:52 UTC 
To reproduce run "vidcontrol -f gallant" when using the vt_vga driver.
Resulting output appears as in the attached screenshot.  
vt_efifb or i915 framebuffer is fine.


Gallant is 12 px wide.  It looks like character positions that don't start at an 8-bit boundary (i.e., every other column) get shifted left to the previous 8-bit boundary, overwriting part of the previous column's character.
Comment 1 Ed Maste freebsd_committer freebsd_triage 2014-07-03 21:36:32 UTC 
Created attachment 144382 [details]
QEMU screenshot of vt_vga with gallant font loaded
Comment 2 Mark Linimon freebsd_committer freebsd_triage 2014-07-08 02:09:44 UTC 
Notify possibly interested party.
Comment 3 Ed Maste freebsd_committer freebsd_triage 2014-08-23 02:37:59 UTC 
Original fix for this issue (r269471) introduced a significant performance regression. New interface introduced in r270322 restores adequate console speed.