ALT Linux Bugzilla – Full Text Bug Listing
| Summary: | aty128fb sometimes puts garbage on the screen | ||||||
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| Product: | Sisyphus | Reporter: | Sergey Vlasov <vsu> | ||||
| Component: | kernel24-up | Assignee: | Peter 'Nidd' Novodvorsky <nidd> | ||||
| Status: | CLOSED FIXED | QA Contact: | |||||
| Severity: | minor | ||||||
| Priority: | P4 | ||||||
| Version: | unstable | ||||||
| Hardware: | all | ||||||
| OS: | Linux | ||||||
| Attachments: |
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in 2.4.20 in 2.4.20 |
With kernel24-up-2.4.18-alt6master (and older versions) and aty128fb sometimes there is garbage on the screen (parts of characters, usually in place of spaces). The effect is sometimes visible in mutt (when sorting by threads and there are many long threads) and very noticeable with the new aptitude (pull down the menu and press Left and Right to move between different submenus). Looking at the source, I have noted two problems: 1. The driver does not wrap display_switch.{clear,revc} in all color depths, therefore some video memory access might be overlapping with the accelerator. 2. The accelerated bmove function always uses left-to-right and top-to-bottom direction, without checking the actual direction of move. When doing overlapped copies, this causes corruption. (The \"insert characters\" control code, which causes part of the line to be shifted right, triggers the problem.) I have made a patch against the driver sources included in kernel24-2.4.18-alt6master to fix the problems. On my system, with the Rage128 Pro card, the fixed driver looks stable. --- ---