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[platforms/drm] introduce env var to select GPU

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Summary:
In some environemnts it is possible that udev detection of primary GPU
fails and it picks the first available card (normally card0). But it is
not desired, and it would be required to use different card (card1).

Introduce environment variable, which when used, will make it possible
to use different card node then one selected by udev.

You can use it like KWIN_DRM_DEVICE_NODE=/dev/dri/card1 kwin_wayland

Test Plan: Tested on the device where card0 was not usable for kms, but card1

Reviewers: #kwin

Subscribers: kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D24051
This commit is contained in:
Bhushan Shah 2019-09-18 15:51:16 +05:30
parent 48691c406e
commit 6b610927f4
1 changed files with 1 additions and 1 deletions
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2
plugins/platforms/drm/drm_backend.cpp
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@ -257,7 +257,7 @@ void DrmBackend::openDrm()
qCWarning(KWIN_DRM) << "Did not find a GPU";
return;
}
m_devNode = device->devNode();
m_devNode = qEnvironmentVariableIsSet("KWIN_DRM_DEVICE_NODE") ? qgetenv("KWIN_DRM_DEVICE_NODE") : QByteArray(device->devNode());
int fd = LogindIntegration::self()->takeDevice(m_devNode.constData());
if (fd < 0) {
qCWarning(KWIN_DRM) << "failed to open drm device at" << m_devNode;