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Diffstat (limited to 'results/scraper/launchpad-without-comments/1752646')
| -rw-r--r-- | results/scraper/launchpad-without-comments/1752646 | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/results/scraper/launchpad-without-comments/1752646 b/results/scraper/launchpad-without-comments/1752646 new file mode 100644 index 000000000..af85ab9bc --- /dev/null +++ b/results/scraper/launchpad-without-comments/1752646 @@ -0,0 +1,22 @@ +Freezing VNC screen on some the UEFI framebuffer applications + +Hi folks! + +I use TianCore (UEFI) formware on the qemu (master version last commit a6e0344). +When kernel/linux is start, it using UEFI Framebuffer. Then I run UEFI application (which writes directly to the framebuffer) my VNS screen is freezing. Then I restart vnclient I see only one frame. + +When I run application, I getting in the file hw/display/vga.c on function 'vga_ioport_write' some commands, it change "s->ar_index" from 0x20 -> 0x10 + +In the function vga_update_display: +1751 if (!(s->ar_index & 0x20)) { +1752 graphic_mode = GMODE_BLANK; +1753 } else { + +And I got GMODE_BLANK mode. If I patch it: +1751 if (0) { + +my VNC not freezing. + +From "Hardware Level VGA and SVGA Video Programming Information Page" I saw, what ar_index is 0x3C0 (Attribute Controller Data Write Register), 0x20(5-bit) is PAS -- Palette Address Source + +If there is a output via the UEFI framebuffer, does the difference have a PAS or not? Why do we need to pause the output if the PAS is exposed? Especially when the application outputs via framebuffer. \ No newline at end of file |