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WindowServer: Implement mechanism to restore safe mode setting
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.
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3 changed files with 15 additions and 3 deletions
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@ -66,8 +66,15 @@ ErrorOr<void> HardwareScreenBackend::set_head_resolution(FBHeadResolution resolu
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mode_setting.vertical_active = resolution.height;
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mode_setting.horizontal_stride = resolution.pitch;
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auto rc = fb_set_head_mode_setting(m_framebuffer_fd, &mode_setting);
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if (rc != 0)
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return Error::from_syscall("fb_set_head_mode_setting", rc);
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if (rc != 0) {
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dbgln("Failed to set backend mode setting: falling back to safe resolution");
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rc = fb_set_safe_head_mode_setting(m_framebuffer_fd);
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if (rc != 0) {
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dbgln("Failed to set backend safe mode setting: aborting");
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return Error::from_syscall("fb_set_safe_head_mode_setting", rc);
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}
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dbgln("Failed to set backend mode setting: falling back to safe resolution - success.");
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}
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}
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return {};
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