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WindowServer: Implement mechanism to restore safe mode setting

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Such mechanism will be used by the Intel Graphics driver, because we
lack support of changing the resolution on this driver currently, so,
when WindowServer will try to mode-set the display then it will fail,
and will use the safe mode-setting call instead to be able to show
something on screen.
This commit is contained in:
Liav A 2022-04-29 20:11:42 +03:00 • committed by Andreas Kling
parent d9a2706079
commit 6d7e2596e0
3 changed files with 15 additions and 3 deletions
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11
Userland/Services/WindowServer/HardwareScreenBackend.cpp
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@ -66,8 +66,15 @@ ErrorOr<void> HardwareScreenBackend::set_head_resolution(FBHeadResolution resolu
mode_setting.vertical_active = resolution.height;
mode_setting.horizontal_stride = resolution.pitch;
auto rc = fb_set_head_mode_setting(m_framebuffer_fd, &mode_setting);
if (rc != 0)
return Error::from_syscall("fb_set_head_mode_setting", rc);
if (rc != 0) {
dbgln("Failed to set backend mode setting: falling back to safe resolution");
rc = fb_set_safe_head_mode_setting(m_framebuffer_fd);
if (rc != 0) {
dbgln("Failed to set backend safe mode setting: aborting");
return Error::from_syscall("fb_set_safe_head_mode_setting", rc);
}
dbgln("Failed to set backend mode setting: falling back to safe resolution - success.");
}
}
return {};