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[ Upstream commit53e977b1d5] Check whether the battery supports the relevant charge threshold before reading the value to silence these errors: thinkpad_acpi: acpi_evalf(BCTG, dd, ...) failed: AE_NOT_FOUND ACPI: \_SB_.PCI0.LPC_.EC__.HKEY: BCTG: evaluate failed thinkpad_acpi: acpi_evalf(BCSG, dd, ...) failed: AE_NOT_FOUND ACPI: \_SB_.PCI0.LPC_.EC__.HKEY: BCSG: evaluate failed when reading the charge thresholds via sysfs on platforms that do not support them such as the ThinkPad T400. Fixes:2801b9683f("thinkpad_acpi: Add support for battery thresholds") Closes: https://bugzilla.kernel.org/show_bug.cgi?id=202619 Signed-off-by: Jonathan Teh <jonathan.teh@outlook.com> Reviewed-by: Mark Pearson <mpearson-lenovo@squebb.ca> Link: https://patch.msgid.link/MI0P293MB01967B206E1CA6F337EBFB12926CA@MI0P293MB0196.ITAP293.PROD.OUTLOOK.COM Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org>