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Diffstat (limited to 'results/classifier/deepseek-2-tmp/reasoning/graphic/1752646')
| -rw-r--r-- | results/classifier/deepseek-2-tmp/reasoning/graphic/1752646 | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/results/classifier/deepseek-2-tmp/reasoning/graphic/1752646 b/results/classifier/deepseek-2-tmp/reasoning/graphic/1752646 new file mode 100644 index 000000000..813c0057e --- /dev/null +++ b/results/classifier/deepseek-2-tmp/reasoning/graphic/1752646 @@ -0,0 +1,28 @@ +<think> +Okay, so I'm trying to figure out how to classify this bug report for QEMU. Let me read through it carefully. + +The user mentions using TianCore UEFI firmware with QEMU and that when they run a kernel (Linux) which uses the UEFI Framebuffer, and then run an UEFI application that writes directly to the framebuffer, their VNC screen freezes. After restarting the VNC client, only one frame is visible. + +They looked into the code in hw/display/vga.c, specifically the function vga_ioport_write, where s->ar_index changes from 0x20 to 0x10. This leads to the function vga_update_display setting graphic_mode to GMODE_BLANK because of line 1751: if (!(s->ar_index & 0x20)) { ... } + +They noticed that by patching this condition to always be false (if (0)), the VNC freezing issue doesn't occur. They also reference hardware documentation where ar_index's 0x20 bit is the PAS (Palette Address Source). + +The question is whether applications outputting via UEFI framebuffer should have PAS exposed, and why VNC would pause if PAS isn't properly handled. + +So, what's going on here? The issue seems to be related to how QEMU handles the VGA display when certain bits in ar_index change. Specifically, changing the PAS bit (0x20) affects whether the display is blanked or not. When the application writes to the framebuffer, it changes this bit, which triggers a blanking mode, freezing VNC. + +The bug report points to QEMU's vga_update_display function as the culprit because when ar_index's 0x20 bit isn't set, it blanks the display. The user is suggesting that perhaps the PAS should not trigger this behavior when applications are outputting through the framebuffer. + +Now, looking at the possible categories: + +- Mistranslation: Incorrect mapping from source to target. This usually involves compiler or translation issues but doesn't seem relevant here. +- Assembly lowering: Not directly related to assembly in this case. +- Other: Too vague, probably not needed if another category fits. +- Device: Could be hardware-related, but maybe more specific. +- Graphic: Directly related to display and framebuffer. This seems the most fitting. +- The other categories (socket, network, KVM, etc.) don't seem relevant here. + +The issue is specifically with how QEMU handles graphics output when certain bits in ar_index are changed by UEFI applications. It affects the VNC display, so it's definitely a graphic-related problem. Therefore, the category should be 'graphic'. +</think> + +graphic \ No newline at end of file |